In reply to Mike Bosio a.k.a. Don Miguel.

Good Guess! It's a place called Tilapita. It's about as far north as you can get on the Guatemalan Pacific coast, right near Mexico. I checked on Google Earth and got the following lat/long coordinates; they have a really good aerial photo if you're interested. You can even see the little river we crossed to get there.

14°30'2.73"N 92°11'10.80"W